Remove non-elderberry herb flavors.

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action. A user action should be tied to an actual
 action taken by a user. It should be logged immediately after a user takes the
@@ skipping 15016 matching lines @@
 
 <action name="TaskManagement.ReturnButtonClicked">
   <owner>dfalcantara@chromium.org</owner>
   <description>
     User hit the &quot;X&quot; button to close the tab. The return button is an
     explicit &quot;close this tab and return to the previous app&quot; button
     that may appear to the left of the Omnibox.  This is different from regular
     tab closing buttons because those doesn't send the user back to the previous
     app.
   </description>
+  <obsolete>The button option was removed and code deleted.</obsolete>
 </action>
 
 <action name="TaskManager">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Terminate_ProcessMismatch_CreateNewWidget">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
@@ skipping 763 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>